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14px;">??聚合氯化鋁在對做水處理試劑使用時，跟它的混凝劑的凝聚機理是有很多關系的，而其凝聚機理與溶液的PH值有關，因而水的堿度也就成為了影響凝聚的主要因素之一，同時也會影響試劑的效果。<br/>??水質情況根據水中的堿度和懸浮物含量，大致可分為以下4種處理類型：<br/>??1、懸浮物含量高而堿度低<br/>??加入混凝劑后，系統PH<7，此時水解產物主要帶正電荷，可通過吸附與電中和來完成凝聚。對Al(Ⅲ)較好的PH值應在6-7之間；對Fe(Ⅲ)則在5-7之間。<br/>??2、懸浮物含量及堿度均高<br/>??當堿度高，以致加入混凝劑后PH值仍達7.5或7.5以上時，混凝劑的水解產物主要帶負電，不能用吸附和電中和來達到凝聚，此時一般采用沉析物網捕的方法，需投加足量的混凝劑，或采用聚合氯化鋁等也可獲得較好效果。<br/>??3、懸浮物含量低而堿度高<br/>??此時，混凝劑的水解產物主要帶有負電荷，故采用沉析網捕法達到混凝。用于混凝劑投加量與懸浮物濃度成反比，因而常需投加助凝劑(如活化硅酸、粘土顆粒等)，以增大原水的膠體顆粒濃度，相應減少混凝劑投加量。<br/>??4、懸浮物含量與堿度均低<br/>??這是很難處理的一種情況。此時，聚合氯化鋁混凝劑可形成帶正電荷的水解產物，但因懸浮顆粒濃度太低，碰撞聚集的機會極少，難以達到凝聚。此時往往采用增加堿度或懸浮物濃度致濁的方法，使其轉化為其他類型的水進行處理。<br/>??懸浮顆粒含量對絮凝、凝聚階段均有影響。因此，在使用聚合氯化鋁時，一定要主要懸浮顆粒含量的多少，從而確定好使用比例和使用量，獲得更好的效果。<br/></span></p> </li> </ul> <div class="f14"> <dd><strong>上一篇：</strong><a href="http://www.jinhengxiang18.com/news/index.php?c=show&id=1250">混凝劑聚合氯化鋁混凝效果受水溫的影響較小</a></dd> <dd><strong>下一篇：</strong><a href="http://www.jinhengxiang18.com/news/index.php?c=show&id=1252">聚合氯化鋁除磷效果如何</a></dd> </div> <div 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